Open AccessMicrostructure and mechanical behavior of similar and dissimilar AA2024 and AA7039 friction stir welds
Author(s) -
Chaitanya Sharma,
Vikas Upadhyay
Publication year - 2020
Publication title -
engineering review
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.198
H-Index - 11
eISSN - 1849-0433
pISSN - 1330-9587
DOI - 10.30765/er.1533
Subject(s) - materials science , ultimate tensile strength , indentation hardness , fracture (geology) , microstructure , tensile testing , brittleness , scanning electron microscope , composite material , friction stir welding , welding , fracture toughness , characterization (materials science) , optical microscope , joint (building) , metallurgy , structural engineering , nanotechnology , engineering
In this work, similar and dissimilar friction stir welds of AA2024 and AA7039 were formed using optimized process parameters and truncated threaded tool. Characterization of weld joints for mechanical and microstructural properties was performed by tensile test, micro hardness test, optical microscopy, scanning electron microscopy, and energy dispersive spectrometry. The tensile strength of similar joints was higher than dissimilar joints despite lower microhardness of former. Fracture of FSW joints was found to be started by the fracture of strengthening precipitate θ or η or both in the region of tensile fracture. Dissimilar joints and similar joints of AA7039 exhibited ductile fracture mode while similar joints of AA2024 showed brittle fracture mode.